Rename: coin PSC, exchange Poinbase, entry upgrade Web3 Governance Community

The entry network upgrade is the gateway to the whole mod, not only
mining: it now delivers the trading terminal and an RZX 50; rigs are
bought from Dr. Jackson, who always stocks one while the player has none.
The upgrade id changes (unreleased, no migration).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Decentralized/Session.cs

@@ -52,7 +52,7 @@ namespace Decentralized
             catch (Exception ex) { Log.Error($"读取存档数据失败，重新开始：{ex.Message}"); }
             if (Data == null) Data = new SaveData();
             if (Data.Market == null) Data.Market = Market.CreateDefault(StoreStation.GetDayCounter());
-            Log.Info($"状态已载入（第 {Data.Day} 天，PSCoin {Data.Market.Price:0.00}）");
+            Log.Info($"状态已载入（第 {Data.Day} 天，PSC {Data.Market.Price:0.00}）");
         }
 
         public static void Save()